I2C Read with 12F629

The Rookie · Guest

Is it possible to read I2C with 12F629 which does not have a I2C engine and does not support I2C_READ() library.

How complex is it to write this routine so that 12F629 can read.

Neutone · Joined: 08 Sep 2003 Posts: 839 Location: Houston

The I2C functions do not require a hardware module that supports I2C. They can be use on a software port. I2C functions are not dificult to write.

rnielsen · Joined: 23 Sep 2003 Posts: 852 Location: Utah

If all you want is a Master I2C controller then you can use the built in I2C functions. Software I2C in a Slave is a bit more difficult.

falleaf · Joined: 23 May 2004 Posts: 48

Have you got some examples of I2C communication on C? I'm trying with CCS C! << Usually use MPASM, but learning to use C.

The rookie · Guest

According to the manual. The master I2C write, start and stop do not require and I2C engine in the micro. But the polling and read is not supported by 12F series micros do not support the builtin I2C read()

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

You need to state whether you want the 12F629 to be an i2c Master
or an i2c Slave.

falleaf · Joined: 23 May 2004 Posts: 48

Oh sorry, I would like to reference for a standard I2C routine in C only. I'm working with 16F876a. I need both master and slave code examples.

May you send me them?

Well, the fact that the slave examples in CCS C is only so simple and it's random read buffer, so I cannot imagine the way to write.

I wrote I2C under ASM, and there are some bits needed to notice. I don't know if writing in C need or no need to check these bits?

For example,

I write PWM in C. To change PWM duty cycles, I need to wait until timer2 is overflow, but I don't know C code will do it or not? Because it only has the set_pwm_duty function only.

I don't know if I have to check timer2 overflow or not?? It's the similar question as I write I2C in C. I'm newbie in C for PIC. Thanks muchie.